The file 'Grundplatte With 5 Entrances (Perpetual For A Marble Run) 3D Printer Model' is (stl) file type, size is 73.0KB.
Now "P_Einsatz_Kurve_60_120.stl" is not useless anymore!
You can also use certain inserts from https://www.thingiverse.com/thing:6778713 which belongs to me.
P_Grundplatte_v2.stl | 210.0KB |